Cleanup namespace usage in platform/graphics/[G-S]*

Source/platform/graphics/GraphicsLayerDebugInfo.h

Index: Source/platform/graphics/GraphicsLayerDebugInfo.h
diff --git a/Source/platform/graphics/GraphicsLayerDebugInfo.h b/Source/platform/graphics/GraphicsLayerDebugInfo.h
index 2d8572984ce58a580924072348391d5eb9061ec6..019e571a211fffe8baec51f4feed1d95262b213c 100644
--- a/Source/platform/graphics/GraphicsLayerDebugInfo.h
+++ b/Source/platform/graphics/GraphicsLayerDebugInfo.h
@@ -40,12 +40,12 @@
 
 namespace blink {
 
-class GraphicsLayerDebugInfo FINAL : public blink::WebGraphicsLayerDebugInfo {
+class GraphicsLayerDebugInfo FINAL : public WebGraphicsLayerDebugInfo {
 public:
     GraphicsLayerDebugInfo();
     virtual ~GraphicsLayerDebugInfo();
 
-    virtual void appendAsTraceFormat(blink::WebString* out) const OVERRIDE;
+    virtual void appendAsTraceFormat(WebString* out) const OVERRIDE;
 
     GraphicsLayerDebugInfo* clone() const;